Concert shell



FIG. 1 is a perspective view of a concert shell showing my new design.

FIG. 2 is a front elevation view thereof.

FIG. 3 is a side elevation view thereof.

FIG. 4 is a perspective view of a modified concert shell showing my new design.

FIG. 5 is a front elevation view thereof.

FIG. 6 is a side elevation view thereof. 

The ornamental design for the concert shell, substantially as shown and described. 